chore(dockerfile): add dependabot config to keep base image up-to-date (INFRA-13) (#670)

Author: SamuelBoerlin

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    ignore:
+      - dependency-name: "node"